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16 inch circumference: radius = diameter / 2. diameter = circumference/pi, so radius = 16 in / 2 / pi = (8/pi) inches [approx 2.55 inches] 16 inch diameter: radius = diameter / 2 = 16 in / 2 = 8 inches.
Radius = diameter/2 so 16/2 = 8 inches.
radius = ½ diameter area circle = π × radius² = π × (½ × 6.5 in)² = 169π/16 in² ≈ 33.2 in²
2 inch radius = 12 9/16" circumference & an area of 12.56637 sq. inches.
A 235 85 16 tire is 31.72 inches in diameter and has a 15.86 inch radius and a 99.65 inch circumference